Wrong version string and missing dependency on python-urlgrabber in createrepo.spec file

Hello Folks,

while playing around with createrepo 0.4.4 I noticed a couple of minor 
glitches.

First createrepo returns the wrong version,

createrepo -V
0.4.3

due to an incorrect version string in genpkgmetadata.py
__version__ = '0.4.3'
should be
__version__ = '0.4.4'

Second, the spec file should have a dependency on python-urlgrabber
as urlgrabber in now imported into genpkgmetadata.py.

Hope this helps,

All the best,

Gareth

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